Break prevention device for calendar advancing of a calendar watch

ABSTRACT

A break prevention device for a calendar watch wherein the calendar advancing wheel includes an elongated adjusting tooth formed with a partial slope at its end and resiliently displaceable out of the plane of the calendar wheel.

United States Patent Miyasaka 1 June 27, 1972 BREAK PREVENTION DEVICE FOR CALENDAR ADVANCING OF A R f r n Cited CALENDAR WATCH FOREIGN PATENTS 0R APPLICATIONS [721 Shimmwa Japan 369 406 6/1963 Switzerland ..58/58 [73] Assignee: Kabuahlki Knish. Suw. Sgikgghg, Toky 412,724 1 1/1966 Switzerland ..58/58 Japan Primary Examiner-Richard B. Wilkinson [22] Flled: 1971 Assistant Examiner-George H. Miller, Jr. 211 APPL 150, 10 Attorney-Blum, Moscovitz, Friedman & Kaplan [57] ABSTRACT [30] Foreign Application Priority Data A break prevention device for a calendar watch wherein the June 11, 1970 Japan .45/57055 cdendar advancing whee] indudes an elongated adjusting tooth formed with a partial slope at its end and resiliently dis- [52] 11.8. CI. ..'....58/58, 58185.5 placeable out f h plane fth calendar wheeL [51] Int. Cl. ..G04b 19/24 [58] Field of Search ..58/58, 63-72, 85.5 5 Claims, 3 Drawing Figures BREAK PREVENTION DEVICE FOR CALENDAR ADVANCING OF A CALENDAR WATCH BACKGROUND OF THE INVENTION above, date correcting may be effected by the correcting wheel 7 even while date advancing tooth 3 advances the date wheel 2. In such circumstances. as shown in FIG. 3, date advancing tooth 3 is pushed downwards along slope 4 by the rected quickly. If the user applies astrong force to the mechanism without knowing these facts, the calendar advancing device, the calendar correcting device, the calendar gear train, and the minute wheel gear train may bebroken. Therefore, in order to prevent this, it is necessary to use an intricate mechanism associated with the finger for calendar advancing.

SUMMARY OF THE INVENTION A break prevention device for a calendar watch is provided including a calendar advancing wheel having an elongated adjusting tooth formed with a partial slope at its end and resiliently displaceable out of-the plane of the calendar wheel when said slope is engaged by a calendar wheel tooth.

The object of thisinvention is to provide a break prevention device for a calendar advancing finger which is simple and effective without increasing the number of parts in the watch.

Still other objects and advantages of the invention will in part be obvious and will in part be apparent from the specification.

The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts which will be exemplified in the constructions hereinafter set forth, and the-scope of the invention will be indicated in the claims. I

BRIEF DESCRIPTION OF THE DRAWING For a fuller understanding of the invention, reference is had to the following description taken in connection with the accompanying drawing, in which:

FIG. I is a plan view of an embodiment of the present inven- DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a date advancing wheel 1 is equipped with a date advancing tooth 3 which is made longer than the other teeth in teeth of date wheel 2 and moved into hole 6 of the plate. Accordingly, breakage on account of date correction is avoided. In addition, in the arrangement according to the invention, when the date advancing wheel is in a position to advance the date wheel 2, said date advancing wheel may be reciprocated in its position to advance the teeth of the date wheel one by one. In this manner, date correcting may be easily performed in watches having no date correcting mechanism.

As described above, unlikenconventional constructions which require special date advancing teeth and the like, break prevention and date correction by reciprocal displacement of the date advancing wheel are obtained without increasing the number of parts and the size of the watch. Further, the arorder to advance a date wheel 2. Date advancing wheel 1 is rotated one complete revolution each day by a transmitting wheel 5 mounted on an hour wheel. The end of the date advancing tooth 3 has a partial slope 4 at its end as shown in FIG. 2, said date advancing tooth having elasticity, so that it can be bent up and down.- A hole 6 in' the plate is provided in the region between date wheel 2 and date advancing wheel 1 so that the date advancing tooth can be bent downwardly. A date cor-' recting wheel 7 is placed so as to correct the date wheel, said date correcting wheel being rotated through a crown in a manner not shown.

In the arrangement according to the invention as described rangement according to the invention has many advantages in respect of manufacturing, cost and use. In addition this construction is usable in the other advancing mechanisms such as the month advancing or day advancing mechanisms.

It willthus be seen that the objects set forth above, and

those made apparent from the preceding description, are efficiently attained and, since certain changes may be made in the above constructions without departing from the spirit and scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

' It is also to be understood that 'the following claims are intended to cover all of the generic and specific features of the invention herein described,- and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

What is claimed is: v

l. A break prevention device for a calendar watch comprising a rotatable calendar wheel'having a plurality of teeth; and a calendar advancing wheel having at least one elongated advancing tooth positioned for cooperative engagement with said calendar wheel teeth for the incremental advancing of said calendar wheel in response to the rotation of said calendar advancing wheel in a first direction, said advancing tooth being formed with a sloped region adjacent its end and being resiliently displaceable out of the plane of said calendar wheel teeth, whereby said advancing tooth drives said calendar wheel when rotated in a first direction, while permitting said calendar wheel to rotate in a second direction opposed to said first direction.

2. A break prevention device as recited in claim 1, wherein said watch includes a plate supporting at least one of said calendar advancing wheel and said calendar wheel, said plate being formed with an aperture therethrough in the region facing the point of contact between said advancing tooth and said calendar wheel teeth for permitting said resilient displacement of said advancing tooth. I

3. A break prevention device as recited in claim I, when said calendar wheel is a date wheel.

4. A break prevention device as recited in claim 1, wherein said calendar wheel is a day wheel.

5. A break prevention device as recited in claim said calendar wheel is a month wheel.

a a a a a I, wherein 

1. A break prevention device for a calendar watch comprising a rotatable calendar wheel having a plurality of teeth; and a calendar advancing wheel having at least one elongated advancing tooth positioned for cooperative engagement with said calendar wheel teeth for the incremental advancing of said calendar wheel in response to the rotation of said calendar advancing wheel in a first direction, said advancing tooth being formed with a sloped region adjacent its end and being resiliently displaceable out of the plane of said calendar wheel teeth, whereby said advancing tooth drives said calendar wheel when rotated in a first direction, while permitting said calendar wheel to rotate in a second direction opposed to said first direction.
 2. A break prevention device as recited in claim 1, wherein said watch includes a plate supporting at least one of said calendar advancing wheel and said calendar wheel, said plate being formed with an aperture therethrough in the region facing the point of contact between said advancing tooth and said calendar wheel teeth for permitting said resilient displacement of said advancing tooth.
 3. A break prevention device as recited in claim 1, when said calendar wheel is a date wheel.
 4. A break prevention device as recited in claim 1, wherein said calendar wheel is a day wheel.
 5. A break prevention device as recited in claim 1, wherein said calendar wheel is a month wheel. 